style(ui): system-wide UX/UI polish pass — design-system conformance + copy cleanup (#835)

* style(ui): system-wide UX/UI polish pass — design-system conformance + copy cleanup

Multi-agent scan of all 404 UI files against the locked design system, then
141 verified surgical fixes across 109 files (net -32 lines):

- Remove forbidden elevation/motion: shadow-* and rounded-xl on cards, active:scale
  bounce, hover:shadow on list items, transition-all -> transition-colors.
- Drop font-medium from single-weight Hedvig display headings/numerals.
- Replace raw rainbow Tailwind status colors with Badge variants / brand tokens /
  neutral surfaces (achromatic chrome, semantic colors stay data-only).
- Route raw dates through formatDate(), hand-rolled currency through formatCurrency(),
  add tabular-nums to financial figures; text-gray-* -> text-foreground tokens.
- Swap hand-rolled skeletons for the Skeleton primitive; off-scale spacing -> token scale.
- Fix copy: mislabeled "Leverantörsfakturor" -> "Utgifter" on bank-import outflow total,
  collapse no-op identical-branch ternaries, broken Swedish diacritics (mojibake),
  correct mismatch-password toast, correct supplier currency-field label.
- Remove PII-leaking debug console.log on register, stray console.logs.

Verified: tsc clean on all changed files, eslint clean, production build passes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(auth): sanitize residual error logs in register flow

Follow-up to PR review (compliance swarm V16 / GDPR Art.5(1)(f)): the
remaining console.error calls in the register flow passed raw error
objects, which Supabase may populate with PII (email) in nested fields.
Log only sanitized message strings instead.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

components/import/BankFilePreviewStep.tsx

@@ -48,7 +48,7 @@ export default function BankFilePreviewStep({
               <FileText className="h-4 w-4" />
               <span className="text-sm">Transaktioner</span>
             </div>
-            <p className="text-2xl font-display font-medium tabular-nums">{stats.parsed_rows}</p>
+            <p className="text-2xl font-display tabular-nums">{stats.parsed_rows}</p>
             {stats.skipped_rows > 0 && (
               <p className="text-xs text-muted-foreground mt-1">
                 {stats.skipped_rows} rader hoppades över
@@ -75,7 +75,7 @@ export default function BankFilePreviewStep({
               <TrendingUp className="h-4 w-4" />
               <span className="text-sm">Inkomster</span>
             </div>
-            <p className="text-lg font-display font-medium tabular-nums">
+            <p className="text-lg font-display tabular-nums">
               {formatCurrency(stats.total_income)}
             </p>
           </CardContent>
@@ -85,9 +85,9 @@ export default function BankFilePreviewStep({
           <CardContent className="pt-6">
             <div className="flex items-center gap-2 text-muted-foreground mb-1">
               <TrendingDown className="h-4 w-4" />
-              <span className="text-sm">Leverantörsfakturor</span>
+              <span className="text-sm">Utgifter</span>
             </div>
-            <p className="text-lg font-display font-medium tabular-nums">
+            <p className="text-lg font-display tabular-nums">
               {formatCurrency(stats.total_expenses)}
             </p>
           </CardContent>
@@ -96,9 +96,9 @@ export default function BankFilePreviewStep({
 
       {/* Warnings */}
       {warnings.length > 0 && (
-        <Card className="border-yellow-300">
+        <Card>
           <CardHeader className="py-3">
-            <CardTitle className="text-sm flex items-center gap-2 text-yellow-600">
+            <CardTitle className="text-sm flex items-center gap-2 text-warning">
               <AlertTriangle className="h-4 w-4" />
               {warnings.length} varning{warnings.length !== 1 ? 'ar' : ''}
             </CardTitle>